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  • 1
    Monograph available for loan
    Monograph available for loan
    Encyclopedia of geomagnetism and paleomagnetism (2007)
    New York, NY [u.a.] : Reinhold
    Associated volumes
    Details Availability
    Call number: 5/N 07.0323
    In: Encyclopedia of earth sciences series
    Type of Medium: Monograph available for loan
    Pages: xxvi, 1054 S.
    ISBN: 9781402039928
    Series Statement: Encyclopedia of earth sciences series
    URL: http://link.springer.com/referencework/10.1007/978-1-4020-4423-6
    Classification:
    Geomagnetism, Geoelectromagnetism
    Location: Reading room
    Branch Library: GFZ Library
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  • 2
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    Encyclopedia of Geomagnetism and Paleomagnetism (2007)
    Dordrecht : Springer
    Details
    Keywords: biomagnetism; dynamo theory ; electromagnetic induction ; environmental magnetics ; geomagnetism ; KLTcatalog ; paleomagnetism ; rock magnetism
    Description / Table of Contents: Understanding the process underlying the origin of Earth magnetic field is one of the greatest challenges left to classical Physics. Geomagnetism, being the oldest Earth science, studies the Earth’s magnetic field in its broadest sense. The magnetic record left in rocks is studied in Paleomagnetism. Both fields have applications, pure and applied: in navigation, in the search for minerals and hydrocarbons, in dating rock sequences, and in unraveling past geologic movements such as plate motions they have contributed to a better understanding of the Earth. Consisting of more than 300 articles written by ca 200 leading experts, this authoritative reference encompasses the entire fields of Geomagnetism and Paleomagnetism in a single volume. It describes in fine detail at an assessable level the state of the current knowledge and provides an up-to-date synthesis of the most basic concepts. As such, it will be an indispensable working tool not only for geophysicists and geophysics students but also for geologists, physicists, atmospheric and environmental scientists, and engineers.
    Pages: Online-Ressource (XXVI, 1054 Seiten)
    ISBN: 9781402044236
    URL: http://link.springer.com/referencework/10.1007/978-1-4020-4423-6
    Language: English
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    E-BOOK
  • 3
    Electronic Resource
    Electronic Resource
    Olduvai termination: detailed palaeomagnetic analysis of a north central Pacific core (1992)
    Oxford, UK : Blackwell Publishing Ltd
    Geophysical journal international 108 (1992), S. 0 
    Details
    ISSN: 1365-246X
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geosciences
    Notes: A high-resolution record of the termination of the Olduvai (normal to reverse) subchron (1.77 Myr) polarity transition was obtained from a fully azimuthally oriented deep-sea sediment piston core, recovered at a northern mid-latitude site (37°22.4′N, 179°36.1′W). The N-R Olduvai reversal was ‘continuously’sampled at 3 to 5 mm intervals across 130 cm of section. This ‘continuous’sampling was achieved by staggering the 1 cc plastic boxes incrementally, so that offset segments corresponding to sampling windows of 3 to 5 mm were obtained. The reversal is well defined, and at least 10 truly intermediate directions have been recorded, displaying a definite directional change of 180° with a pronounced decrease in intensity of magnetization. The decrease of magnetization and the directional change coincide closely. The inclination record during the transition is characterized by a brief steepening trend early in the reversal passing through high positive values, followed by a gradual shallowing trend, this time passing through the horizontal. From this point on, the inclinations show a final settling about the reversed polarity mean. This record is characterized by full normal and reverse polarity directions which are in good agreement (±2°) with those predicted by the geocentric axial dipole field model for the core site latitude. The estimated duration of the directional change was about 10 000 yr whereas that of the intensity decrease was between 12000 and 16 000 yr. Anhysteretic Remanent Magnetization (ARM) studies and thermomagnetic analyses indicate that a uniform magnetic mineralogy characterizes the transition zone of the core. This further suggests that the J10/ARM70 ratio may represent a relative palaeointensity estimate and may thus indicate a decrease of the intensity of the geomagnetic field during the reversal. The virtual geomagnetic pole (VGP) path of the record is far-sided. Directions in projected (D′, I′) space indicate that the N-R Olduvai reversal transition field geometry had contributions from both non-axisymmetric and axisymmetric terms. The results based on this single record show that:(1) The palaeofield at this locality during the Olduvai transition was characterized by contributions from both zonal and non-zonal terms but the contribution of non-zonal quadrupolar terms was predominant. This is in contrast to the observation by Herrero-Bervera et al. (1991), based on four deep-sea records in which the VGPs show general confinement within the longitude band of the Americas and their antipode, that the transitional field may be dominated by a dipolar component.(2) The field intensity dropped to about 22 per cent of its initial or final recovered value during the transition. It stayed at or close to this minimum for approximately half or less of the overall intensity change.(3) The VGP path is longitudinally constrained.(4) The duration of the directional cycle is about 10 000 yr and that of the intensity change cycle about 12 000-16 000 yr. These conclusions are generally supported by the interpretation given to the other two available deep-sea records
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-246X.1992.tb04634.x
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  • 4
    Electronic Resource
    Electronic Resource
    Preface (1996)
    Springer
    Surveys in geophysics 17 (1996), S. 151-154 
    Details
    ISSN: 1573-0956
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01908671
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  • 5
    Electronic Resource
    Electronic Resource
    Reversal records from Eastern Icelandic lava flows and their geodynamic significance (1996)
    Springer
    Surveys in geophysics 17 (1996), S. 197-206 
    Details
    ISSN: 1573-0956
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01908679
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  • 6
    Electronic Resource
    Electronic Resource
    Geomagnetic reversal paths (1991)
    [s.l.] : Nature Publishing Group
    Nature 351 (1991), S. 447-447 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] SIR - New palaeomagnetic records of the transitional fields during geomagnetic rever-sals are bringing about a radical revision of ideas on the morphology of these fields. Recently, we and others have reported many new reversal records, a remarkable prepon-derance of which show the position of the ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/351447a0
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  • 7
    Electronic Resource
    Electronic Resource
    Non-axisymmetric behaviour of Olduvai and Jaramillo polarity transitions recorded in north-central Pacific deep-sea sediments (1986)
    [s.l.] : Nature Publishing Group
    Nature 322 (1986), S. 159-162 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] The palaeomagnetic data presented here are associated with a pair of sequential reversals (R-N and N-R) from a fully azimuthally-oriented piston core2'6'7 (K78030; 1855.9' N, 16070.8' W) taken near the Hawaiian island of Kauai. The other two records are from two other fully azimuthally-oriented ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/322159a0
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  • 8
    Electronic Resource
    Electronic Resource
    Geomagnetic reversal paths (1992)
    [s.l.] : Nature Publishing Group
    Nature 359 (1992), S. 111-112 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] SIR - Valet et al.1 concluded that there is no statistical evidence for a preferred sector of longitude in the distribution of mean virtual geomagnetic pole (VGP) paths during reversals. This contradicts the earlier suggestion that the transitional field VGPs have a tendency to follow the ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/359111b0
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  • 9
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    On the directional geomagnetic signature of the Pringle Falls excursion recorded at Pringle Falls, Oregon, USA (2013)
    In:  Geological Society Special Publication 373: 261-278.
    Details
    Publication Date: 2013-07-02
    Description: We studied the detailed characteristics of the Pringle Falls excursion from samples at the original site recovered from four profiles drilled along the Deschutes River, Oregon. We drilled 827 samples spaced along 5 km for their detailed directional study. The profiles registered a high-resolution (〉10 cm/ka) palaeomagnetic record of the excursion (c. 211±13 ka) recorded by diatomaceous lacustrine sediments. We conducted palaeomagnetic and rock magnetic studies to investigate the reproducibility of the signal throughout the profiles. We performed low-field susceptibility v. temperature analysis that indicated that the main magnetic carrier is pure magnetite (Curie point 575 °C). The magnetic grain size also indicated single domain–multi domain (SD–MD) magnetite. The demagnetization was performed by alternating field experiments and the mean directions were determined by principal component analyses. The detailed behaviour of the palaeosignal is highly consistent since they are rapidly deposited sediments providing a detailed representation of the palaeofield. The dissected virtual geomagnetic pole paths in three different phases are highly internally consistent and are defined by clockwise and anticlockwise loops travelling from high northern latitudes over eastern North America and the North Atlantic to South America and then to high southern latitudes; then they return to high northern latitudes through the Pacific and over to Kamchatka.
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  • 10
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    On the palaeomagnetic and rock magnetic constraints regarding the age of IODP 325 Hole M0058A (2013)
    In:  Geological Society Special Publication 373: 279-291.
    Details
    Publication Date: 2013-07-02
    Description: We have studied the rock magnetic and palaeomagnetic properties of a 41 m long core (Hole M0058A) recovering calcareous sediments located seaward of Noggin Reef, offshore Queensland, Australia to decipher the magnetostratigrapy of the site. We deployed 1 cm3 samples at every 10 cm down-core and subsampled the core by means of U-channels in order to obtain a continuous record. Stepwise alternating field demagnetization from natural remanent magnetization to 80 mT showed that the characteristic remanent magnetization was isolated at low demagnetization fields between 0 and 15 mT. We conducted magnetic granulometry analyses and Curie point determinations. The low-field v. temperature analyses indicate the presence of Ti-poor magnetite with Curie points from 560 to 563 °C. Hysteresis loop experiments were performed. The results show Mrs/Ms and Hcr/Hc ratios corresponding to single domain to multi-domain and super-paramagnetic to single domain ranges. Both discrete and continuous inclination results indicate a remarkable correlation of three excursional inclinations occurring during intervals of low intensity of magnetization closely corresponding to the Laschamp (c. 41 ka), Skálamælifell (c. 94 ka) and Blake (c. 115–120 ka) ‘aborted reversals,’ and indicate that the base of the core is much older than the Blake excursion.
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